“emulation” VS “simulation”

What is "emulation" and how does it differ from "simulation"?

Emulation is an attempt to imitate the internal design of a device. Simulation is an attempt to imitate functions of a device. For example, a program imitating the Pacman arcade hardware and running real Pacman ROM on it is an emulator. A Pacman game written for your computer but using graphics similar to the real arcade is a simulator.


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